Tumor necrosis factor-alpha-induced secretion of RANTES and interleukin-6 from human airway smooth muscle cells: modulation by glucocorticoids and beta-agonists.

American Journal of Respiratory Cell and Molecular Biology
Alaina J AmmitReynold A Panettieri

Abstract

Recent studies have demonstrated that tumor necrosis factor (TNF)-alpha stimulates the secretion of interleukin (IL)-6 and regulated on activation, normal T cells expressed and secreted (RANTES) from airway smooth muscle (ASM) cells, with the induction of each molecule being differentially regulated (IL-6 increased, RANTES inhibited) by cyclic adenosine monophosphate (cAMP)-elevating agents. In this study we identify the mechanisms mediating IL-6 and RANTES gene transcription in human ASM cells. We found that TNF-alpha induced IL-6 gene expression in ASM cells via a nuclear factor (NF)-kappaB-dependent pathway, whereas RANTES gene expression was mediated via activation of activator protein (AP)-1 and nuclear factor of activated T cells (NF-AT). TNF-alpha-induced IL-6 secretion was only partially inhibited by dexamethasone, yet TNF-alpha-induced RANTES secretion was abolished. beta-Agonists induced IL-6 secretion from ASM via activation of the CRE region of the IL-6 promoter. beta-Agonists augmented TNF-alpha-induced IL-6 secretion, reflecting an additive effect of NF-kappaB and CRE response elements on IL-6 gene expression. In contrast, beta-agonists inhibited TNF-alpha-induced RANTES secretion via an AP-1-independent pathway. ...Continue Reading

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